Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de6979ba9c3b4ab…

MALICIOUS

PDF

52.2 KB Created: 2020-07-30 15:39:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fb0bdaf98a8145a772f1a8927529ec4 SHA-1: ff77149ab5aa2b1db7feb59f90e384e8dddc9b1f SHA-256: 1de6979ba9c3b4ab112d1a6babfec0a42424647a61c563127929bd6fcc57c93e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits a PDF link farm heuristic, with numerous links pointing to Shopify-hosted PDFs, suggesting a coordinated effort to distribute malicious content or phish users. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a common tool for creating PDFs from web content, further supporting the idea that the PDF is a delivery mechanism for external links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=teaching+critical+thinking+creativity+problem+solving+pdf
    • http://files.criminallyinteresting.net/uploads/1/3/2/6/132695430/16afeac9.pdf
    • http://files.annaengels.com/uploads/1/3/0/9/130969656/9322509.pdf
    • http://files.praxeum.org/uploads/1/3/2/6/132695445/d69d3.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1741554469.pdf
    • https://cdn.shopify.com/s/files/1/0428/1984/6311/files/57744627231.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8246/files/69667873038.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/28543594879.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62894204366.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8918/files/wekelefowuxosufubabapu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6347/5352/files/nomunukavuz.pdf
    • https://cdn.shopify.com/s/files/1/0440/0935/7477/files/fifilavidodabidigosetuwij.pdf
    • https://cdn.shopify.com/s/files/1/0437/2309/6216/files/fajapapodakawetomimawez.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/51283906038.pdf
    • https://cdn.shopify.com/s/files/1/0433/2155/7147/files/folofo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4670/7104/files/nomisalegu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4397/7366/files/xaxal.pdf
    • https://cdn.shopify.com/s/files/1/0428/6762/2055/files/41824743258.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://cdn.shopify.com/s/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008db2.bin
c5c018ef9fff579c28c6925ac2906fd3b08ab2e53fcec45961c4e461c6413981		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB2 5672 bytes
font_01_sfnt_off0000a0ca.bin
2574dd138bb573a5484b6189638a9a259beb2a48bee9c4a751577dbdeb54a816		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0CA 10112 bytes

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